Connection · one ticket · schedule Jun 6 – Jul 31, 2026 · records Aug 2025 – Jul 2026
Dulles → San Francisco via Boston: arrives on time 75%
-
08:35 IAD → 10:20 BOSUA 641 · United · 1h 45m · 92% on time, 1.5% cancelled
-
1h 15m layover in Boston (BOS) · 45 min minimum on one ticket
-
11:35 BOS → 15:02 SFOUA 1074 · United · 6h 27m · 80% on time, 0.4% cancelled
Total trip 9h 27m, scheduled departure to arrival (San Francisco is 3 h behind Dulles). Times are local. Both flew on 46 of the last 56 days.
Makes the connection95%The first flight arrived more than 30 minutes late on 5% of the days it flew: too late for the 45-minute minimum connection on a 1h 15m layover.
Arrives on time75%First flight not cancelled (1.5% are) × connection made (95%) × second flight not cancelled (0.4% are) and within 15 minutes (80%).
Total trip9h 27mIAD 08:35 to SFO 15:02, layover included
Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.